Question

9. Which one of the following green house gases is a contributor due to incomplete combusu
of coal and petroleum?
(1) Oxides of nitrogen
(ii) Methane
(iii) Carbon monoxide
(iv) Carbon dioxide
10. Which of the following reactions is an endothermic reaction?
1) Burning of coal
(ii) Decomposition of vegetable matter into compost.
(m) Process of respiration
() Decomposition of calcium carbonate to form quick lime and carbon dioxide
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Answer 1

Answer:

9.

(iv)carbon dioxide

10.(

iv)decomposition of calcium carbonate to form quick lime and carbon dioxide